Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 32

Table 8—Maximum Allowable Exposed Vent Pipe Length (ft) With and Without Insulation in Winter Design
WINTER DESIGN
UNIT
TEMPERATURE
SIZE
040
060
080
100
120
140
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length
as specified in Table 7.
† Insulation thickness based on R value of 3.5 per in.
Fig. 41—Rooftop Termination (Dimension "A" is Touching or 2-in. Maximum Separation)
2. Locate heat tape between sides of condensate trap back. (See
Fig. 47.)
3. Use wire ties to secure heat tape in place. Wire ties can be
positioned in notches of condensate trap sides. (See Fig. 47.)
4. Wrap field drain pipe with remaining heat tape, approximately
1 wrap per ft.
Temperature Ambient*
MAX PIPE
DIAMETER
(°F) (IN.)
20 1.5
0 1.5
-20 1.5
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2.5
0 2.5
-20 2.5
20 2.5
0 2.5
-20 2.5
20 3
0 3
-20 3
20 3
0 3
-20 3
20 4
0 4
-20 4
20 3
0 3
-20 3
20 4
0 4
-20 4
WITHOUT
INSULATION
51
28
16
45
22
10
65
35
20
55
48
30
70
47
28
40
40
38
70
50
28
70
61
37
70
48
23
60
60
44
70
57
30
A
5. When using field-supplied heat tape, follow heat tape manu-
facturer's instructions for all other installation guidelines.
32
WITH 3/8–IN. OR
THICKER INSULATION†
70
70
70
70
70
58
70
70
70
55
55
55
70
70
70
40
40
40
70
70
70
70
70
70
70
70
70
60
60
60
70
70
70
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